Back at my old job, we always had a lot of calls from Indians claiming we did some sort of survey for them before, yada yada yada.. So every time they called we would add their phone# to a “Limbo Line” in the Switchvox phone switch in case they ever called back, which would send them to a never ending queue with no options configured so they couldn’t press 0 and go to the front desk. This held the record, ha

We got quite a few spam calls to our DIDs, I configured some routes so that anonymous calls get sent back to the IVR. Most telemarketers don't want to get caught up in going through that and the unsolicited calls have mostly stopped.

One of the advantages is that this way in the event of a customer getting new service or something and their accounts identity isn't setup yet they can still get to who they were looking for.

For my home Asterisk install I have a call queue that has nyan cat as the background music, and plays the "Thank you for holding" every 15 seconds. So far I haven't had to use it, because all the spam calls I get are recorded messages :(

That's pretty good. Personally I simply add the annoying CID to busy tone or disconnected tone on my SIP provider's website. Works good as long as the person isn't spoofing CID (I check online first to see if anyone else has complained about whatever #).

I have a switchvox and recruiters that never stop calling us to the point the C-levels are having us manually blocking numbers. I'd rather just piss off these callers. Can you briefly tell me how you setup that up?